2 results about "Expansive clay" patented technology

The present application relates to the technical field of geothermal resource development and utilization, in particular to a Guantao group geothermal recharge well gel pretreatment agent, by weight percentage, comprising: citric acid: 10%-30%; organic acid: 2%-5%; corrosion inhibitor: 1%-4%; chelating agent: 0.1%-2%; iron ion stabilizer: 1%-4%; clay stabilizer: 1%-2%; anti-swelling agent: 1%-4%; calcium gluconate: 0.2%-0.4%; ferrous gluconate: 0.2%-0.4% and the rest is water. The present application does not use strong acid, strong base and strong oxidizing agent, ensuring construction safety. The system selects raw materials with the same composition as the formation water, can achieve no residue, remove the blockage of chemical agents in the oil and gas production process, reduce the seepage pressure, increase the water yield of geothermal well and recharge. Not only can prevent clay swelling, but also can realize the shrinkage of expanded clay, thereby reducing the migration of fine particles and having a certain sand prevention effect.

An aqueous barrier coating for a paper product can include a chemically unmodified expansive clay dispersed in a binder, where the expansive clay is dispersed under high shear conditions such that the expansive clay is present in the form of crystalloid agglomerates.